4 



Melvill, Descriptions of Marine Mollusca. 



Nassa (Niotha) mammillifera, sp. nov. (PL 6, f. 2). 



N. testa fusiformi, spira attenuata, ad apicem acuta, 

 gracili, solidiuscula, anfractibus octo, quorum apicalibus 

 duobus, vitreis, Iczvibus, cczteris apud suturas midtum 

 impressis, subventricosis supernis tribus, ultimo undecim gem- 

 midarum vel mammillarum ordinibus spiralibus decorato, 

 mamillis parvis, rotundis, nitidis, valde regularibus, infra 

 suturas et ad medium ultimi anfvactus obscure rufo-vittata, 

 apevtura oblonga, labro extus paullum cjfuso, incrassato, 

 nitido, albo, intus denticulato, canali brevi, marginc columel- 

 lari paullum effosso, dente suturali prominente. 



Long. 11, lat. 5 mm., sp. maj. 



Hab. Persian Gulf. 



Five specimens of a small Nassa, which is unlike any 

 in the National collection. It would appear near N. 

 margaritifera Dunker. The above description will show 

 its peculiarities, the very regular mammillate nodules, 

 three-rowed in the upper whorls, eleven-rowed in the 

 lowest, with much attenuation of whorl, and sharp apex. 

 The shell is obscurely banded transversely with rufous. 



Nassa (Hima) Townsendi, sp. nov. (PL 6, f. 1). 



N. testa fusiformi, elegant er superne attenuata, sub- 

 turrita, pallidc brunnea, anfractibus octo, tumidulis, ad 

 suturas impressis, longitudinaliter arete obliquicostatis, spira- 

 litcy liratis, costis ad juncturis lirarum clathrato-noduliferis, 

 liris ultimi anfractus ergd basin fortioribus, ad suturas et 

 ad medium ultimi anfractus obscure rufocincta, apertura 

 subrotunda, sinu canali lato, peristomate extus incrassato, 

 intus sex crenato-dentato, dente suturali prominente. 



Long. 14, lat. 6 mm. 



Hab. Mekran Coast. 



An elegantly formed Nassa, the upper whorls becoming 

 much attenuate, somewhat tumid, impressed at the 



